1327772721 has 8 divisors (see below), whose sum is σ = 1931305824. Its totient is φ = 804710720.

The previous prime is 1327772689. The next prime is 1327772729. The reversal of 1327772721 is 1272777231.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1327772721 - 2⁵ = 1327772689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1327772721.

It is not an unprimeable number, because it can be changed into a prime (1327772729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20117736 + ... + 20117801.

It is an arithmetic number, because the mean of its divisors is an integer number (241413228).

Almost surely, 2^1327772721 is an apocalyptic number.

1327772721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1327772721 is a deficient number, since it is larger than the sum of its proper divisors (603533103).

1327772721 is a wasteful number, since it uses less digits than its factorization.

1327772721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40235551.

The product of its digits is 57624, while the sum is 39.

The square root of 1327772721 is about 36438.6157942368. The cubic root of 1327772721 is about 1099.1102228880.

The spelling of 1327772721 in words is "one billion, three hundred twenty-seven million, seven hundred seventy-two thousand, seven hundred twenty-one".